Hazard And Operability Study for Determining Safety Integrity Level on Surface Above Ground System and Unit 1 And Unit 2 Geothermal Power Plant in Ulumbu Field
Keywords:
Hazard, Operability, Safety, Level, Risk, AssessmentAbstract
This study applies the Hazard and Operability (HAZOP) method to identify potential process risks and determine the Safety Integrity Level (SIL) of the Surface Above Ground System (SAGS) and Units 1 and 2 at the Ulumbu Geothermal Power Plant. Using process documentation, maintenance records, and operational data from 2020–2024, eight critical nodes were analyzed. Risk was evaluated using a matrix based on severity and likelihood, with failure probabilities derived from Mean Time to Failure (MTTF) and the OREDA database. The SIL assessment was conducted in accordance with IEC 61511. Results showed that most nodes operated under SIL 2, indicating a generally adequate safety system. However, several nodes—particularly those in the demister and lube oil systems—fell under SIL 1, suggesting the need for improvement. The study recommends additional shutdown valves to enhance protective functions, particularly in scenarios involving rupture disks. Overall, the findings provide insights into system vulnerabilities and support recommendations for improving the safety integrity of geothermal plant operations.
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